AU2015200023A1

AU2015200023A1 - Welding method for the shielding of hardened wearing elements in hoppers, buckets or other similar equipment

Info

Publication number: AU2015200023A1
Application number: AU2015200023A
Authority: AU
Inventors: Bernardo Vera Torres; Claudio Zamorano Jones
Original assignee: Minetec SA
Current assignee: Minetec SA
Priority date: 2014-11-21
Filing date: 2015-01-06
Publication date: 2016-06-09
Also published as: PE20160630A1; BR102014031428A2; US20160144440A1; MX2014014742A; CL2014003166A1

Abstract

A welding method for hardened wearing elements such as straps, retaining walls, blocks and various forms of shielding plates used in hoppers, ladies and any component that needs to be protected with hardened wearing elements, which prevents stress in the binding welded between the straps and allows joining straps with very little spacing between them so that no wearing grooves are formed. The method includes placing two straps separated by a minimum space on the base plate to be welded; separating the straps to be welded allowing a minimum of 0.5 to 5 mm; welding with a welding bead; using discontinuous welding beads; applying the welding bead on the side edges of the straps and discontinuing the welding bead in areas close to the space between two straps. Figure 5

Description

WELDING METHOD FOR THE SHIELDING OF HARDENED WEARING ELEMENTS IN HOPPERS, BUCKETS OR OTHER SIMILAR EQUIPMENT

FIELD OF THE INVENTION

[001 ] The invention is related to the field of shields for earthmoving elements subject to wear, specifically the invention relates to a method of welding for hardened wearing elements, such as straps, retaining walls, blocks and various forms of shielding plates.

BACKGROUND TO THE INVENTION

[002] Hardened material shields (anti-abrasive steel) are used for coating earthmoving elements, such as truck hoppers, crane buckets, excavator shovels and others. This material may be mounted using fastening or welding elements to such elements as shielding parts of varying size and shape.

[003] Application WO 2013059334 discloses the use of hardened metal straps for shielding a truck hopper, the use of straps located transversely or diagonally to the axis of the hopper and also pieces of hardened material located at the corner points of the loading box are observed in this material, and those hardened material straps or pieces are mounted to the hopper floor by welding.

[004] US2004002659 also discloses wear-resistant plates or straps welded to a truck hopper’s body floor.

[005] Furthermore, there are companies selling various coatings for mechanical elements, which are welded, as in the case of the DOMITE or RAPTOR companies. The former company hardened “sachet” bars for installation in earthmoving elements subject to wear.

[006] The present invention provides a new method of welding wear elements.

SUMMARY OF THE INVENTION

[007] In a broad aspect, the present invention discloses a method of welding which covers only the lateral sides of the straps and not their ends which are adjacent to the next strap. The weld beads of the lateral sides have their start and end before the discontinuities. This method prevents cracks during work and allows stress relief in the area of separation between the straps.

[008] In accordance with a first aspect of the present invention there is provided a method of welding for hardened wearing elements, such as straps, retaining walls, blocks and various forms of shielding plates, used in hoppers, buckets or any component that needs to be guarded by hardened wearing elements that prevents stresses in the joint welded between the straps, and allows joining straps with little separation between them, so that no wearing grooves are formed, comprising: placing two straps separated by a minimum space on the base plate to be welded; separating the straps to be welded allowing a minimum space of about 0.5 to 5 mm; welding with a weld bead; using discontinuous weld beads; apply the weld bead at the lateral sides of the straps; and discontinuing the weld bead in areas close to the space between two straps.

[009] The welding method may be applied on curved surfaces.

[010] The welding method may be carried out with MIG system, TIG, manual arc, submerged arc or any other arc welding process and filler material.

[011] The welding method can be applied when straps (1) include an intermediate material (6) between the base plate (5) and the strap (1).

BRIEF DESCRIPTION OF THE FIGURES

[012] The present invention will be more clearly understood when the description following of the preferred embodiments of the invention will be read in conjunction with the drawings, and in those drawings: [013] Figure 1 a shows a front view of the weld to the base plate for two guarding elements separated from each other and surrounded by the weld bead representing the prior art.

[014] Figure 1b shows a top view of the weld to the base plate for two guarding elements separated from each other and surrounded by the weld bead representing the prior art.

[015] Figure 2a shows a front view of the weld to the base plate for two guarding elements close to each other and joined together by a continuous weld bead representing the prior art.

[016] Figure 2b shows a top view of the weld to the base plate for two guarding elements close to each other and joined together by a continuous weld bead representing the prior art.

[017] Figure 3a shows a front view of the weld to the base plate for one longer guarding element joined via a continuous weld bead.

[018] Figure 3b shows a top view of the weld to the base plate for a longer guarding element joined via a continuous weld bead.

[019] Figure 4a shows a front view of the weld to the base plate for two guarding elements close to each other and joined together by a discontinuous weld bead.

[020] Figure 4b shows a top view of the weld to the base plate for two guarding elements close to each other and joined together by a discontinuous weld bead.

[021 ] Figure 5 shows an isometric view which depicts two guarding elements that are welded discontinuously to an intermediate material between these elements and the base plate.

[022] Figure 6 shows an isometric view of how wearing elements are joined by a discontinuous welding, such as that of the invention, which considers an intermediate material on curved surfaces.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS OF THE INVENTION

[023] A method of joining straps (1) to a base plate (5) which is commonly used in the State of the Art may be that shown in Figure 1 a and 1 b, where two adjacent straps (1) are welded to the base plate (5), for example, in a hopper, bucket or shovel with continuous weld beads (2.3) on all sides to prevent the material from entering under the strap (1) making it finally separate from the base plate (5), furthermore, the space (4) between the two straps, and which is necessary to create the weld bead (3) between the two straps, allows the hopper or bucket, when emptying, to slide material between said spaces (4), causing wearing of the base plate (5).

[024] Another method of joining straps (1) to the base plate (5) which is also commonly used in the State of the Art may be that shown Figure 2a and 2b, where two adjacent straps (1) are welded to the base plate (5), for example, in a hopper or bucket with continuous weld beads on lateral sides, by a single continuous weld bead (2) on each side, since in this case the two straps (1) are very slightly apart and the space (4) between them is minimum, in this case no material is deposited between the two straps (1) in the space (4), but there are stresses in the continuous weld bead (2) just below the space (4) separating one strap (1) from the other, since it does not allow for flexibility of the floor or base plate (5) with respect to each of the straps (1) individually, leading to sliding of the straps and/or cracking in the weld bead with use.

[025] A third method for joining straps (1) to a base plate (5) which is also commonly used in the State of the Art may be that shown in Figure 3a and 3b, where a longer strap (7) is welded to the base plate (5) by a continuous weld bead. In this case, being a single strap, no disruption of the bead is required, the disadvantage is that, being a single larger and non-joining strap, stresses are transmitted to this strap and may lead to cracks and crevices, since antiabrasive steels are not intended for structural use. The complication is even bigger in this method when the base plate is curved, since it involves bending the strap, causing additional internal stresses.

[026] The proposed solution and the purpose of the invention are depicted in Figures 4a, 4b and 5 where it can be seen that two straps (1) are separated by a minimum space (4), the weld bead (2) is applied to the lateral sides of said straps (1), thus disrupting the weld bead (2) just before reaching the separation space (4) of both straps (1) to continue welding a little beyond that space on the next strap (1). Therefore, the accumulation of material in the space (4) between both straps (1) is prevented, and stresses in the weld bead in the area of separation (4) of both straps (1) are also avoided. The method is also applied to straps (1) that consider an intermediate material (6) between the base plate (5) and the straps (1), as is the case of shielding straps with retaining walls or a bilayer shielding, as shown in Figure 5.

[027] The method of welding may also be applied to curved surfaces, such as a base plate (5), as shown in Figure 6, in which an intermediate material (6) is used, upon which the wearing elements that may be straps are welded (1).

[028] The welding for this method may be done using MIG system, TIG, manual arc, submerged arc or any other arc welding process and filler material.

[029] Any reference to or discussion of any document, act or item of knowledge in this specification is included solely for the purpose of providing a context for the present invention. It is not suggested or represented that any of these matters or any combination thereof formed at the priority date part of the common general knowledge, or was known to be relevant to an attempt to solve any problem with which this specification is concerned.

[030] It is to be noted that, throughout the description and claims of this specification, the word 'comprise' and variations of the word, such as 'comprising' and 'comprises', is not intended to exclude other variants or additional components, integers or steps. Modifications and improvements to the invention will be readily apparent to those skilled in the art. Such modifications and improvements are intended to be within the scope of this invention.

[031 ] The scope of the claims is to be defined and limited only by the words and phrases in the claims and the numerals are to be read only with a view to providing clarity to assist understanding. That is, any numerals in the claims that follow are not to be taken as a limitation of the terms or phrases of the claims.

Claims

The claims defining the invention are as follows:

1. A method of welding for hardened wearing elements, such as straps, retaining walls, blocks and various forms of shielding plates, used in hoppers, buckets or any component that needs to be guarded by hardened wearing elements that prevents stresses in the joint welded between the straps, and allows joining straps with little separation between them, so that no wearing grooves are formed, comprising: placing two straps (1) separated by a minimum space (4) on the base plate (5) to be welded; separating the straps to be welded allowing a minimum space (4) of 0.5 to 5 mm welding with a weld bead (2); using discontinuous weld beads (2); apply the weld bead (2) at the lateral sides of the straps (1); and discontinuing the weld bead in areas close to the space (4) between two straps (1).

2. The welding method according to claim 1, applied on curved surfaces.

3. The welding method according to claim 1 or 2, carried out with MIG system, TIG, manual arc, submerged arc or any other arc welding process and filler material.

4. The welding method according to any one of claims 1 to 3, applied when straps (1) include an intermediate material (6) between the base plate (5) and the strap (1)-